GREELEY, Colo. (AP)

Prosecutors had said 23-year-old Draton Mares shot 42-year-old Thomas Bashline in the back of the head in Bashline's bedroom in November 2011, then stole his vehicle. Bashline's girlfriend found his body in the home they shared.

A Weld County jury on Thursday convicted Mares of first-degree murder and aggravated motor vehicle theft.

Investigators say Mares and Bashline had met several times for sexual encounters. Mares testified that he shot Bashline after one encounter soured and Bashline treated him abusively and called him a derogatory name.

Mares' attorney argued that he didn't plan the killing and only fired in the heat of passion.